## Files in this item

FilesDescriptionFormat

application/pdf

9416432.pdf (7MB)
(no description provided)PDF

## Description

 Title: Experimental studies of multipass beam breakup and energy recovery using the CEBAF injector linac Author(s): Sereno, Nicholas S.R. Doctoral Committee Chair(s): Cardman, Lawrence S. Department / Program: Physics Discipline: Physics Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Physics, General Abstract: Beam breakup (BBU) instabilities in superconducting linacs are a significant issue due to the potentially high Q of the cavity higher-order modes (HOMs). The CEBAF accelerator, which employs five pass recirculation through two superconducting linacs to accelerate high CW current (up to 200 $\mu$A), poses unique instability problems. An experimental investigation of multipass BBU at CEBAF has been completed using a single recirculation through the CEBAF injector linac. This recirculator is calculated to be more sensitive to the instability than the full CEBAF accelerator. Successful recirculation through the injector of a beam with greater than 200 $\mu$A average current from an injection energy of 5.6 MeV to a final energy of 80.1 MeV indicates that BBU should not be a problem in the full CEBAF accelerator. In addition, we were able recover all the energy from a 30 $\mu$A 42.8 MeV first pass beam by recirculating it out of phase and decelerating it to a final energy equal to the injection energy (5.6 MeV). Issue Date: 1994 Type: Text Language: English URI: http://hdl.handle.net/2142/19305 Rights Information: Copyright 1994 Sereno, Nicholas S. R. Date Available in IDEALS: 2011-05-07 Identifier in Online Catalog: AAI9416432 OCLC Identifier: (UMI)AAI9416432
﻿